Method of power handling in tokamak power reactors

A method of power handling in tokamak power reactors using heavy impurity injection is discussed. In this method, iron powder is injected together with the fuel gas through holes in the divertor plate, which leads to strong impurity radiation from the divertor plasma. The method is effective in establishing a dense and cold plasma and in reducing the heat flux to the divertor plate under the conditions of a power reactor. In a simulation with a 2-D divertor code it is shown that the injected heavy impurity does not flow into the main plasma because of strong friction forces between impurity and fuel ions